/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

import java.util.*;

public class AClass {

    public int instanceInteger = 0;
    public int instanceMethod() {
        return instanceInteger;
    }

    public static int classInteger = 0;
    public static int classMethod() {
        return classInteger;
    }

    public static void main(String[] args) {
        AClass anInstance = new AClass();
        AClass anotherInstance = new AClass();

        //Refer to instance members through an instance.
        anInstance.instanceInteger = 1;
        anotherInstance.instanceInteger = 2;
        System.out.format("%s%n", anInstance.instanceMethod());
        System.out.format("%s%n", anotherInstance.instanceMethod());

        //Illegal to refer directly to instance members from a class method
        //System.out.format("%s%n", instanceMethod());    //illegal
        //System.out.format("%s%n", instanceInteger);     //illegal

        //Refer to class members through the class...
        AClass.classInteger = 7;
        System.out.format("%s%n", classMethod());

        //...or through an instance.
        System.out.format("%s%n", anInstance.classMethod());

	//Instances share class variables
        anInstance.classInteger = 9;
        System.out.format("%s%n", anInstance.classMethod());
        System.out.format("%s%n", anotherInstance.classMethod());
    }
}
